S-92949A866 5/16"-24 x 4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ideal for harsh environments
• Exceptional thread precision with Class 3A fit and UNF fine threading ensures reliable, vibration-resistant connections
• High tensile strength of 70,000 psi provides dependable load-bearing capacity for heavy-duty applications
• Easy installation and removal with 3/16" hex drive and rounded button head design for secure tool engagement
• Full threading along the 4" length offers maximum grip and adjustment flexibility in deep assemblies
• Consistent hardness (Rockwell B55) maintains structural integrity under repeated stress and torque
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety

Professional Applications & Engineering Value

This 5/16"-24 x 4" stainless steel rounded head screw delivers critical performance in demanding industrial settings. The 18-8 Stainless Steel material combined with a passivated finish resists oxidation and chemical exposure, extending service life in machinery, marine equipment, and outdoor structures. The Class 3A thread fit and UNF fine threads prevent loosening from vibrations, making it ideal for precision assemblies in automotive, aerospace, and manufacturing. Its fully threaded design and hex drive enable quick, secure fastening in deep or hard-to-reach areas, reducing installation time and improving maintenance efficiency.

Specification Summary & Compliance

This screw features a Class 3A thread fit per UNF standards, ensuring tight tolerances and reliable engagement. It meets ASME B18.3 specifications (ASTM F879) for dimensional accuracy and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free of hazardous substances, supporting safe and sustainable industrial use.